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Synthesis of Hydroxy-Sodalite/Cancrinite Zeolites from Calcite-Bearing Kaolin for the Removal of Heavy Metal Ions in Aqueous Media

  • A hydroxy-sodalite/cancrinite zeolite composite was synthesized from low-grade calcite-bearing kaolin by hydrothermal alkali-activation method at 160 C for 6 h. The effect of calcite addition on the formation of the hydroxy-sodalite/cancrinite composite was investigated using artificial mixtures. The chemical composition and crystal morphology of the synthesized zeolite composite were characterized by X-ray powder diffraction, infrared spectroscopy, scanning electron microscopy, and N2 adsorption/desorption analyses. The average specific surface area is around 17–20 m2g-1, whereas the average pore size lies in the mesoporous range (19–21 nm). The synthesized zeolite composite was used as an adsorbent for the removal of heavy metals in aqueous solutions. Batch experiments were employed to study the influence of adsorbent dosage on heavy metal removal e� ciency. Results demonstrate the effective removal of significant quantities of Cu, Pb, Ni, and Zn from aqueous media. A comparative study of synthesized hydroxy-sodalite and hydroxy-sodalite/cancrinite composites revealed the latter was 16–24% more effcient at removing heavy metals from water. The order of metal uptake effciency for these zeolites was determined to be Pb > Cu > Zn > Ni. These results indicate that zeolite composites synthesized from natural calcite-bearing kaolin materials could represent effective and low-cost adsorbents for heavy metal removal using water treatment devices in regions of water hortage.
Metadaten
Author: Muayad EsaifanORCiD, Laurence N. Warr, Georg Grathoff, Tammo Meyer, Maria-Theresia Schafmeister, Angela Kruth, Holger Testrich
URN:urn:nbn:de:gbv:9-opus-37429
DOI:https://doi.org/https://doi.org/10.3390/min9080484
ISSN:2075-163X
Parent Title (German):minerals
Publisher:MDPI
Place of publication:Basel
Document Type:Article
Language:English
Date of first Publication:2019/08/13
Release Date:2020/05/10
Last Page:484
Faculties:Mathematisch-Naturwissenschaftliche Fakultät / Institut für Geographie und Geologie
Licence (German):License LogoCreative Commons - Namensnennung